What is the primary function of a Local Area Network (LAN)?

The primary function of a Local Area Network (LAN) is to facilitate communication and resource sharing among devices within a limited geographic area, which typically encompasses a single building or a group of adjacent buildings. This type of network allows multiple computers, printers, and other devices to connect and communicate with one another efficiently. By providing a localized setup, LANs enable users to share data, applications, and devices like printers, making them cost-effective and convenient for small to medium-sized organizations or home environments.

The other options describe different types of networks or functionalities. A network that spans multiple cities and regions is more representative of a Wide Area Network (WAN). Connecting personal portable devices is a broader category not specific to LAN technology, as such connectivity could occur over various types of networks, not just LANs. Finally, a network specifically used for mobile devices would pertain more closely to mobile networks or wireless networks tailored for cellular data rather than the typical structure and purpose of a LAN.